High-charge energetic electron bunch generated by intersecting laser pulses

Yang, Lei; Deng, Zhigang; Zhou, C. T.; Yu, M. Y.; Wang, Xingang

doi:10.1063/1.4794352

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…This charge persisted through the rest of the interaction and was accelerated to near-GeV energies after the pulses separated. The persistence of trapped charge following the interaction is in contrast with previous work using intersecting pulses with mutually perpendicular polarization [4], where charge that had been injected into the merged wake structure was lost as the crossing laser pulses separated. Compared to Ref.…”

Section: Simulations and Discussioncontrasting

confidence: 51%

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Interaction between laser pulses and trailing wakefields intersecting at small angle for LWFA charge yield enhancement

Weichman¹,

Higuera²,

Abell³

et al. 2017

AIP Conference Proceedings

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Abstract. Increasing the high energy electron yield from laser wakefield acceleration is crucial to its development as an electron beam source. We present a scheme for charge yield enhancement using two equal-intensity pulses-or hot spots in a single laser pulse-intersecting at a small angle. Experiments on the Texas Petawatt Laser with two well-defined hot spots yielded more than ten times as much charge as the single-hot-spot case. VORPAL particle-in-cell simulations suggest the charge yield enhancement depends on the hot-spot intersection angle and the relative phase between spots.

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Section: Simulations and Discussioncontrasting

confidence: 51%

“…Compared to Ref. [4], our work uses pulses intersecting at smaller angle in lower density plasma. In our simulations, the interaction occurred over a much longer distance, leading to a more gradual separation of the merged wake, which may explain why charge can remain trapped through the separation process.…”

Section: Simulations and Discussionmentioning

confidence: 99%

Interaction between laser pulses and trailing wakefields intersecting at small angle for LWFA charge yield enhancement

Weichman¹,

Higuera²,

Abell³

et al. 2017

AIP Conference Proceedings

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“…Wen et al [27] investigate how charge loading and electron energy is affected by copropagating wakefields, as a possible means for increasing the wakefield current. Yang et al [28] deviate from the limitation of co-propagation and present PIC simulations for two different angles (0.09 and 0.15 rad) of collision between the wakefields, for the purpose of eval-uating effects of the angle on charge loading and energy spread. The head-on collision between wakefields was considered by Deng et al [29], using PIC simulations to investigate the wakefield front dynamics as well as the ensuing electron oscillations.…”

Section: Introductionmentioning

confidence: 99%

Radiation emission from braided electrons in interacting wakefields

2017

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The radiation emission from electrons wiggling in a laser wakefield acceleration (LWFA) process, being initially considered as a parasitic effect for the electron energy gain, can eventually serve as a novel X-ray source, that could be used for diagnostic purposes. Although several schemes for enhancing the X-ray emission in LWFA has been recently proposed and analyzed, finding an efficient way to use and control these radiation emissions remains an important problem. Based on analytical estimates and 3D particle-in-cell simulations, we here propose and examine a new method utilizing two colliding LWFA patterns with an angle in-between their propagation directions. Varying the angle of collision, the distance of acceleration before the collision and other parameters provide an unprecedented control over the emission parameters. Moreover, we reveal here that for a collision angle of 5 • , the two wakefields merge into a single LWFA cavity inducing strong and stable collective oscillations between the two trapped electron bunches. This results in an X-ray emission which is strongly peaked, both in the spatial and frequency domain. The basic concept of the proposed scheme may pave a way for using LWFA radiation sources in many important applications, such as phase-contrast radiography.

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Dual effects of stochastic heating on electron injection in laser wakefield acceleration

et al. 2014

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Electron injection into the wakefield of an intense short laser pulse by a weaker laser pulse propagating in the opposite direction is reconsidered using two-dimensional (2D) particle-in-cell simulations as well as analytical modeling. It is found that for linearly polarized lasers the injection efficiency and the quality of the wakefield accelerated electrons increase with the intensity of the injection laser only up to a certain level, and then decreases. Theory and simulation tracking test electrons originally in the beat region of the two laser pulses show that the reduction of the injection efficiency at high injection-laser intensities is caused by stochastic overheating of the affected electrons.

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High-charge energetic electron bunch generated by intersecting laser pulses

Cited by 10 publications

References 26 publications

Interaction between laser pulses and trailing wakefields intersecting at small angle for LWFA charge yield enhancement

Interaction between laser pulses and trailing wakefields intersecting at small angle for LWFA charge yield enhancement

Radiation emission from braided electrons in interacting wakefields

Dual effects of stochastic heating on electron injection in laser wakefield acceleration

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